Cork cambium produces
a. vascular tissue.
b. heartwood.
c. vascular cambium.
d. sapwood.
e. secondary epidermis.
E
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Consider the structure of a trophic pyramid when answering the following questions: Why are shrimp more abundant than whales in the ocean?
A. Whales reproduce more slowly, so maintain small population sizes. B. More energy is available to primary consumers, and thus the biomass/abundance of primary consumers is greater than that of secondary consumers. C. Whales are warm-blooded secondary consumers and lose more energy as heat, therefore their level on a trophic pyramid is smaller (more narrow) than for shrimp (primary consumers). D. The levels of the trophic pyramid represent the percentage of primary producers that make up a consumer's diet. Whales eat less of the primary producers, so their level on a trophic pyramid is smaller than the level for shrimp.
How do flagella bend?
a. myosin motor proteins slide microtubules over each other b. dynein motor proteins slide microtubule doublets over each other c. myosin motor proteins slide actin filaments over each other d. microfilaments contract due to the action of kinesin e. actin filaments contract due to the action of myosin
BSL-1 bacteria are very dangerous
a. true b. false
During an experiment, which factors are observed and measured?
A.) dependent variables B.) independent variables C.) constants D.) hypotheses